The venereal disease research laboratory (VDRL) test is designed to assess whether or not you have syphilis, a sexually transmitted infection. Instead of testing for the bacteria that causes syphilis, the VDRL test checks for antibodies to this ba...

A rapid plasma regain (RPR) test is a blood test used to screen patients for syphilis. It works by detecting the antibodies that the body produces to fight the infection. Syphilis is a sexually transmitted infection that can be fatal if left untre...

Your body's immune system produces proteins known as antibodies when harmful substances are detected. These harmful substances, called antigens, take many forms, including parasites, viruses, fungi, and bacteria. The FTA-ABS blood test (fluorescen...